1. If the pattern repeats "blue, red, green, yellow," then it moves in cycles of four. Listing the first few tokens helps you visualize the progression:
B, R, G, Y, B, R, G, Y, B, R, G, Y...
Here we see that the Y token always falls on a multiple of four, and the G token is just in front of every Y token in the order. Thus, the G token will always be at a position one less than a multiple of four. 120 is the only multiple of four provided, so 119 is the answer.
2. To find the probability in a dice problem, we have to find the number of desired possibilities (in this case, sums of 17 or 18) and divide that by the number of total possibilities (in this case, total number of sums possible).
The total number of sums is 6 * 6 * 6 = 216. This is because we can add any of 6 possibilities of the first die, 6 in the second, and 6 in the third to my sum. Thus, 6 numbers * 6 numbers * 6 numbers = 216 sums.
Now, how many desired possibilities are there? It should be clear that there is 1 possibility in which all the dice show a 6 and therefore sum to 18. Then, for the sum of 17, there are three possibilities: (5, 6, 6), (6, 5, 6), and (6, 6, 5). Hence, there are 4 desired possibilities.
We're almost there! The probability, as I said earlier, is desired / total. 4/216 = 1/54, so that's your answer.
Hope that helped!